An out-of-balance garage door puts stress on the entire opening system, whether it's manual or automatic. It can also pose a safety issue because it won't move smoothly and it may close unexpectedly fast, bypassing the safety sensors. Check the balance of your garage door at least twice a year.
Step #1: Disconnect the automatic opener.
If you have an automatic garage door, pull the disconnect cable that hangs from the carriage trolley near the automatic opener on the garage ceiling.